title: A new class of pyrazolopyridine nucleus with fluorescent properties, obtained through either a radical or a Pd arylation pathway from N-azinylpyridinium N-aminides.
abstract: The synthesis of dipyridopyrazole and pyridopyrazolopyrazine derivatives--both of which incorporate a 3-aryl moiety--can be achieved in moderate yields by intramolecular radical arylation of pyridinium N-aminides using tris(trimethylsilyl)silane and azobisisobutyronitrile. Improved results were obtained on using Pd direct arylation in conjunction with microwave irradiation. A preliminary study into the fluorescent properties of the target compounds is also reported.
authors.affiliation: Departamento de Química Orgánica, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain.
authors.forename: Valentina
authors.initials: V
authors.lastname: Abet
authors.forename: Araceli
authors.initials: A
authors.lastname: Nuñez
authors.forename: Francisco
authors.initials: F
authors.lastname: Mendicuti
authors.forename: Carolina
authors.initials: C
authors.lastname: Burgos
authors.forename: Julio
authors.initials: J
authors.lastname: Alvarez-Builla